Ethereum Architecture and Transaction Lifecycle BBLC Practice Questions (Page 4)

Questions 16–20

1. 16foundation · easy

   Which of the following statements accurately describes how messages are executed in Ethereum?

   • AMessages are executed as part of the transaction that triggered them and do not appear as separate transactions
   • BMessages are signed by the contract that sends them
   • CMessages are broadcast to the network and wait in the mempool
   • DMessages are executed only if the sender provides a separate gas payment
   Reveal Solution Discussion Select an answer first
2. 17application · medium

   A user sends a transaction with a gas limit of 100,000 and a gas price of 20 gwei. The EVM executes the transaction and consumes 80,000 gas before completing successfully. How much Ether is charged to the user's account?

   • A80,000 gwei
   • B1,600,000 gwei (0.0016 ETH)
   • C20,000 gwei
   • D2,000,000 gwei (0.002 ETH)
   Reveal Solution Discussion Select an answer first
4. 18application · medium

   In Ethereum's Proof of Stake consensus, a validator proposes a block containing several transactions. After the block is proposed, what is the next step in the consensus process?

   • AThe block is immediately finalized and cannot be reverted.
   • BOther validators attest to the block, and it is finalized after enough attestations.
   • CMiners compete to solve a cryptographic puzzle to add the block.
   • DThe block is broadcast to all nodes, and each node independently re-executes all transactions.
   Reveal Solution Discussion Select an answer first
5. 19foundation · easy

   What does the 'gas limit' in an Ethereum transaction represent?

   • AThe price per unit of gas the sender is willing to pay
   • BThe number of blocks the transaction will wait before being dropped
   • CThe total amount of ether to be transferred
   • DThe maximum amount of gas the transaction is allowed to consume
   Reveal Solution Discussion Select an answer first
6. 20expert · hard

   A user sends a transaction with a nonce of 5. The user then sends another transaction with a nonce of 6, but the transaction with nonce 5 is still pending. What will happen to the transaction with nonce 6?

   • AIt will remain pending until the transaction with nonce 5 is mined.
   • BIt will be processed immediately because the network prioritizes higher gas prices.
   • CIt will be mined in the same block as nonce 5, but after it.
   • DIt will be rejected by the network because the nonce is not contiguous.
   Reveal Solution Discussion Select an answer first